Effect of light intensity on the bioenergetics and thermodynamics of batch Arthrospira (Spirulina) platensis culture

The bioenergetics and thermodynamics of the batch culture of Arthrospira (Spirulina) platensis was investigated at different light intensity conditions (40, 70 and 100 μmol m-2 s-1) in horizontal photobioreactor (HoP). The results indicate that the increase in biomass yield on Gibbs energy (YGX) was favored by a progressive increase in light intensity up to 100 μmol m-2 s-1, reaching a maximum cell concentration of about 8.6 g/L. An increase in light intensity favored cell growth because of photolimitation in the tested range, and the YGX fall was observed after 6.5 and 7.5 days at 40 and 70 μmol m-2 s-1, respectively, whereas no fall was detected at 108 μmol m-2 s-1 even after 8.5 days. A progressive increase in the light intensity did not exert any appreciable influence on number of moles of photons for the growth of 1 C-mol of biomass up to 6.5 days. These results demonstrate that light intensity was the growth-limiting factor under the selected conditions - See more at: https://proceedings.galoa.com.br/cobeq/cobeq-2016/trabalhos/effect-of-light-intensity-in-the-bioenergetics-and-thermodynamics-of-batch-arthrospira-spirulina#sthash.uBHApsG4.dpuf